The team have to find an anti-terrorism device that was stolen before the city falls under attack. Plus, Hetty is haunted by her troubling past.
Ian, Carl, Lip and Debbie try to work out how to pay off a meth dealer. Fiona deals with a vindictive tenant. Lip is concerned for Professor Youens. Frank reaches sainthood.
Billy blames Eric for a leak on an internet video-sharing site; Drama joins an exclusive club; Ari and Lloyd play dirty.